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Finding the Fourth Proportional to 643.34, 969.11 and 579.25

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Solution

The fourth proportional to 643.34, 969.11 and 579.25 is: 872.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.34 : 969.11 = 579.25 : x
  2. Step 2: Convert to fraction form
    643.34/969.11 = 579.25/x
  3. Step 3: Cross multiply
    643.34x = 969.11 × 579.25
  4. Step 4: Simplify right side
    643.34x = 561,360.71
  5. Step 5: Solve for x
    x = 561,360.71/643.34
  6. Step 6: Final answer
    x = 872.57

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.